Apple desktops have touchpads now too. The new Magic Trackpad gives Mac Pro and iMac owners…
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This simple, non-invasive hack requires only a wooden dowel (approximately Magic Trackpad battery-circumferenced) with a screw in each end, a USB cord, and some spare wire. Remove your Trackpad batteries, strip the USB cord—carefully—down to red and black wires, and attached them to the corresponding poles of the adaptor. Like so:

And there you have it! It may not be as pretty, but it's way more efficient and green—assuming that the Magic Trackpad doesn't mind the 5V of USB power instead of the 3V two AA batteries will give you.